Aroma diffuser



FIG. 1 is a front elevational view of an aroma diffuser showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines show portions of the Aroma Diffuser that form no part of the claimed design. 

CLAIM The ornamental design for an aroma diffuser, as shown and described. 